/*
 * Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
 * Original author: Edmund Wagner
 * Creation date: 31.05.2007
 *
 * Source: $HeadURL$
 * Last changed: $LastChangedDate$
 * 
 * the unrar licence applies to all junrar source and binary distributions 
 * you are not allowed to use this source to re-create the RAR compression algorithm
 * 
 * Here some html entities which can be used for escaping javadoc tags:
 * "&":  "&#038;" or "&amp;"
 * "<":  "&#060;" or "&lt;"
 * ">":  "&#062;" or "&gt;"
 * "@":  "&#064;" 
 */
package com.github.junrar.unpack.vm;

import java.util.List;
import java.util.Vector;

import com.github.junrar.crc.RarCRC;
import com.github.junrar.io.Raw;

/**
 * DOCUMENT ME
 * 
 * @author $LastChangedBy$
 * @version $LastChangedRevision$
 */
public class RarVM extends BitInput {

	public static final int VM_MEMSIZE = 0x40000;

	public static final int VM_MEMMASK = (VM_MEMSIZE - 1);

	public static final int VM_GLOBALMEMADDR = 0x3C000;

	public static final int VM_GLOBALMEMSIZE = 0x2000;

	public static final int VM_FIXEDGLOBALSIZE = 64;

	private static final int regCount = 8;

	private static final long UINT_MASK = 0xffffFFFF;// ((long)2*(long)Integer.MAX_VALUE);

	private byte[] mem;

	private int[] R = new int[regCount];

	private int flags;

	private int maxOpCount = 25000000;

	private int codeSize;

	private int IP;

	public RarVM() {
		mem = null;
	}

	public void init() {
		if (mem == null) {
			mem = new byte[VM_MEMSIZE + 4];
		}
	}

	private boolean isVMMem(byte[] mem) {
		return this.mem == mem;
	}

	private int getValue(boolean byteMode, byte[] mem, int offset) {
		if (byteMode) {
			if (isVMMem(mem)) {
				return (mem[offset]);
			} else {
				return (mem[offset] & 0xff);
			}
		} else {
			if (isVMMem(mem)) {
				// little
				return Raw.readIntLittleEndian(mem, offset);
			} else
				// big endian
				return Raw.readIntBigEndian(mem, offset);
		}
	}

	private void setValue(boolean byteMode, byte[] mem, int offset, int value) {
		if (byteMode) {
			if (isVMMem(mem)) {
				mem[offset] = (byte) value;
			} else {
				mem[offset] = (byte) ((mem[offset] & 0x00) | (byte) (value & 0xff));
			}
		} else {
			if (isVMMem(mem)) {
				Raw.writeIntLittleEndian(mem, offset, value);
				// mem[offset + 0] = (byte) value;
				// mem[offset + 1] = (byte) (value >>> 8);
				// mem[offset + 2] = (byte) (value >>> 16);
				// mem[offset + 3] = (byte) (value >>> 24);
			} else {
				Raw.writeIntBigEndian(mem, offset, value);
				// mem[offset + 3] = (byte) value;
				// mem[offset + 2] = (byte) (value >>> 8);
				// mem[offset + 1] = (byte) (value >>> 16);
				// mem[offset + 0] = (byte) (value >>> 24);
			}

		}
		// #define SET_VALUE(ByteMode,Addr,Value) SetValue(ByteMode,(uint
		// *)Addr,Value)
	}

	public void setLowEndianValue(byte[] mem, int offset, int value) {
		Raw.writeIntLittleEndian(mem, offset, value);
		// mem[offset + 0] = (byte) (value&0xff);
		// mem[offset + 1] = (byte) ((value >>> 8)&0xff);
		// mem[offset + 2] = (byte) ((value >>> 16)&0xff);
		// mem[offset + 3] = (byte) ((value >>> 24)&0xff);
	}

	public void setLowEndianValue(Vector<Byte> mem, int offset, int value) {
		mem.set(offset + 0, Byte.valueOf((byte) (value & 0xff)));
		mem.set(offset + 1, Byte.valueOf((byte) ((value >>> 8) & 0xff)));
		mem.set(offset + 2, Byte.valueOf((byte) ((value >>> 16) & 0xff)));
		mem.set(offset + 3, Byte.valueOf((byte) ((value >>> 24) & 0xff)));
	}

	private int getOperand(VMPreparedOperand cmdOp) {
		int ret = 0;
		if (cmdOp.getType() == VMOpType.VM_OPREGMEM) {
			int pos = (cmdOp.getOffset() + cmdOp.getBase()) & VM_MEMMASK;
			ret = Raw.readIntLittleEndian(mem, pos);
		} else {
			int pos = cmdOp.getOffset();
			ret = Raw.readIntLittleEndian(mem, pos);
		}
		return ret;
	}

	public void execute(VMPreparedProgram prg) {
		for (int i = 0; i < prg.getInitR().length; i++) // memcpy(R,Prg->InitR,sizeof(Prg->InitR));
		{
			R[i] = prg.getInitR()[i];
		}

		long globalSize = Math
				.min(prg.getGlobalData().size(), VM_GLOBALMEMSIZE) & 0xffFFffFF;
		if (globalSize != 0) {
			for (int i = 0; i < globalSize; i++) // memcpy(Mem+VM_GLOBALMEMADDR,&Prg->GlobalData[0],GlobalSize);
			{
				mem[VM_GLOBALMEMADDR + i] = prg.getGlobalData().get(i);
			}

		}
		long staticSize = Math.min(prg.getStaticData().size(), VM_GLOBALMEMSIZE
				- globalSize) & 0xffFFffFF;
		if (staticSize != 0) {
			for (int i = 0; i < staticSize; i++) // memcpy(Mem+VM_GLOBALMEMADDR+GlobalSize,&Prg->StaticData[0],StaticSize);
			{
				mem[VM_GLOBALMEMADDR + (int) globalSize + i] = prg
						.getStaticData().get(i);
			}

		}
		R[7] = VM_MEMSIZE;
		flags = 0;

		List<VMPreparedCommand> preparedCode = prg.getAltCmd().size() != 0 ? prg
				.getAltCmd() : prg.getCmd();

		if (!ExecuteCode(preparedCode, prg.getCmdCount())) {
			preparedCode.get(0).setOpCode(VMCommands.VM_RET);
		}
		int newBlockPos = getValue(false, mem, VM_GLOBALMEMADDR + 0x20)
				& VM_MEMMASK;
		int newBlockSize = getValue(false, mem, VM_GLOBALMEMADDR + 0x1c)
				& VM_MEMMASK;
		if ((newBlockPos + newBlockSize) >= VM_MEMSIZE) {
			newBlockPos = 0;
			newBlockSize = 0;
		}

		prg.setFilteredDataOffset(newBlockPos);
		prg.setFilteredDataSize(newBlockSize);

		prg.getGlobalData().clear();

		int dataSize = Math.min(getValue(false, mem, VM_GLOBALMEMADDR + 0x30),
				VM_GLOBALMEMSIZE - VM_FIXEDGLOBALSIZE);
		if (dataSize != 0) {
			prg.getGlobalData().setSize(dataSize + VM_FIXEDGLOBALSIZE);
			// ->GlobalData.Add(dataSize+VM_FIXEDGLOBALSIZE);

			for (int i = 0; i < dataSize + VM_FIXEDGLOBALSIZE; i++) // memcpy(&Prg->GlobalData[0],&Mem[VM_GLOBALMEMADDR],DataSize+VM_FIXEDGLOBALSIZE);
			{
				prg.getGlobalData().set(i, mem[VM_GLOBALMEMADDR + i]);
			}
		}
	}

	public byte[] getMem() {
		return mem;
	}

	private boolean setIP(int ip) {
		if ((ip) >= codeSize) {
			return (true);
		}

		if (--maxOpCount <= 0) {
			return (false);
		}

		IP = ip;
		return true;
	}

	private boolean ExecuteCode(List<VMPreparedCommand> preparedCode,
			int cmdCount) {

		maxOpCount = 25000000;
		this.codeSize = cmdCount;
		this.IP = 0;

		while (true) {
			VMPreparedCommand cmd = preparedCode.get(IP);
			int op1 = getOperand(cmd.getOp1());
			int op2 = getOperand(cmd.getOp2());
			switch (cmd.getOpCode()) {
			case VM_MOV:
				setValue(cmd.isByteMode(), mem, op1,
						getValue(cmd.isByteMode(), mem, op2)); // SET_VALUE(Cmd->ByteMode,Op1,GET_VALUE(Cmd->ByteMode,Op2));
				break;
			case VM_MOVB:
				setValue(true, mem, op1, getValue(true, mem, op2));
				break;
			case VM_MOVD:
				setValue(false, mem, op1, getValue(false, mem, op2));
				break;

			case VM_CMP: {
				int value1 = getValue(cmd.isByteMode(), mem, op1);
				int result = value1 - getValue(cmd.isByteMode(), mem, op2);

				if (result == 0) {
					flags = VMFlags.VM_FZ.getFlag();
				} else {
					flags = (result > value1) ? 1 : 0 | (result & VMFlags.VM_FS
							.getFlag());
				}
			}
				break;

			case VM_CMPB: {
				int value1 = getValue(true, mem, op1);
				int result = value1 - getValue(true, mem, op2);
				if (result == 0) {
					flags = VMFlags.VM_FZ.getFlag();
				} else {
					flags = (result > value1) ? 1 : 0 | (result & VMFlags.VM_FS
							.getFlag());
				}
			}
				break;
			case VM_CMPD: {
				int value1 = getValue(false, mem, op1);
				int result = value1 - getValue(false, mem, op2);
				if (result == 0) {
					flags = VMFlags.VM_FZ.getFlag();
				} else {
					flags = (result > value1) ? 1 : 0 | (result & VMFlags.VM_FS
							.getFlag());
				}
			}
				break;

			case VM_ADD: {
				int value1 = getValue(cmd.isByteMode(), mem, op1);
				int result = (int) ((((long) value1 + (long) getValue(
						cmd.isByteMode(), mem, op2))) & 0xffffffff);
				if (cmd.isByteMode()) {
					result &= 0xff;
					flags = (result < value1) ? 1
							: 0 | (result == 0 ? VMFlags.VM_FZ.getFlag()
									: ((result & 0x80) != 0) ? VMFlags.VM_FS
											.getFlag() : 0);
					// Flags=(Result<Value1)|(Result==0 ? VM_FZ:((Result&0x80) ?
					// VM_FS:0));
				} else
					flags = (result < value1) ? 1
							: 0 | (result == 0 ? VMFlags.VM_FZ.getFlag()
									: (result & VMFlags.VM_FS.getFlag()));
				setValue(cmd.isByteMode(), mem, op1, result);
			}
				break;

			case VM_ADDB:
				setValue(true, mem, op1,
						(int) (getValue(true, mem, op1) & 0xFFffFFff
								+ (long) getValue(true, mem, op2) & 0xFFffFFff));
				break;
			case VM_ADDD:
				setValue(
						false,
						mem,
						op1,
						(int) (getValue(false, mem, op1) & 0xFFffFFff
								+ (long) getValue(false, mem, op2) & 0xFFffFFff));
				break;

			case VM_SUB: {
				int value1 = getValue(cmd.isByteMode(), mem, op1);
				int result = (int) (value1 & 0xffFFffFF
						- (long) getValue(cmd.isByteMode(), mem, op2) & 0xFFffFFff);
				flags = (result == 0) ? VMFlags.VM_FZ.getFlag()
						: (result > value1) ? 1 : 0 | (result & VMFlags.VM_FS
								.getFlag());
				setValue(cmd.isByteMode(), mem, op1, result);// (Cmd->ByteMode,Op1,Result);
			}
				break;

			case VM_SUBB:
				setValue(true, mem, op1,
						(int) (getValue(true, mem, op1) & 0xFFffFFff
								- (long) getValue(true, mem, op2) & 0xFFffFFff));
				break;
			case VM_SUBD:
				setValue(
						false,
						mem,
						op1,
						(int) (getValue(false, mem, op1) & 0xFFffFFff
								- (long) getValue(false, mem, op2) & 0xFFffFFff));
				break;

			case VM_JZ:
				if ((flags & VMFlags.VM_FZ.getFlag()) != 0) {
					setIP(getValue(false, mem, op1));
					continue;
				}
				break;
			case VM_JNZ:
				if ((flags & VMFlags.VM_FZ.getFlag()) == 0) {
					setIP(getValue(false, mem, op1));
					continue;
				}
				break;
			case VM_INC: {
				int result = (int) ((long) getValue(cmd.isByteMode(), mem, op1) & 0xFFffFFff + 1);
				if (cmd.isByteMode()) {
					result &= 0xff;
				}

				setValue(cmd.isByteMode(), mem, op1, result);
				flags = result == 0 ? VMFlags.VM_FZ.getFlag() : result
						& VMFlags.VM_FS.getFlag();
			}
				break;

			case VM_INCB:
				setValue(
						true,
						mem,
						op1,
						(int) ((long) getValue(true, mem, op1) & 0xFFffFFff + 1));
				break;
			case VM_INCD:
				setValue(
						false,
						mem,
						op1,
						(int) ((long) getValue(false, mem, op1) & 0xFFffFFff + 1));
				break;

			case VM_DEC: {
				int result = (int) ((long) getValue(cmd.isByteMode(), mem, op1) & 0xFFffFFff - 1);
				setValue(cmd.isByteMode(), mem, op1, result);
				flags = result == 0 ? VMFlags.VM_FZ.getFlag() : result
						& VMFlags.VM_FS.getFlag();
			}
				break;

			case VM_DECB:
				setValue(
						true,
						mem,
						op1,
						(int) ((long) getValue(true, mem, op1) & 0xFFffFFff - 1));
				break;
			case VM_DECD:
				setValue(
						false,
						mem,
						op1,
						(int) ((long) getValue(false, mem, op1) & 0xFFffFFff - 1));
				break;

			case VM_JMP:
				setIP(getValue(false, mem, op1));
				continue;
			case VM_XOR: {
				int result = getValue(cmd.isByteMode(), mem, op1)
						^ getValue(cmd.isByteMode(), mem, op2);
				flags = result == 0 ? VMFlags.VM_FZ.getFlag() : result
						& VMFlags.VM_FS.getFlag();
				setValue(cmd.isByteMode(), mem, op1, result);
			}
				break;
			case VM_AND: {
				int result = getValue(cmd.isByteMode(), mem, op1)
						& getValue(cmd.isByteMode(), mem, op2);
				flags = result == 0 ? VMFlags.VM_FZ.getFlag() : result
						& VMFlags.VM_FS.getFlag();
				setValue(cmd.isByteMode(), mem, op1, result);
			}
				break;
			case VM_OR: {
				int result = getValue(cmd.isByteMode(), mem, op1)
						| getValue(cmd.isByteMode(), mem, op2);
				flags = result == 0 ? VMFlags.VM_FZ.getFlag() : result
						& VMFlags.VM_FS.getFlag();
				setValue(cmd.isByteMode(), mem, op1, result);
			}
				break;
			case VM_TEST: {
				int result = getValue(cmd.isByteMode(), mem, op1)
						& getValue(cmd.isByteMode(), mem, op2);
				flags = result == 0 ? VMFlags.VM_FZ.getFlag() : result
						& VMFlags.VM_FS.getFlag();
			}
				break;
			case VM_JS:
				if ((flags & VMFlags.VM_FS.getFlag()) != 0) {
					setIP(getValue(false, mem, op1));
					continue;
				}
				break;
			case VM_JNS:
				if ((flags & VMFlags.VM_FS.getFlag()) == 0) {
					setIP(getValue(false, mem, op1));
					continue;
				}
				break;
			case VM_JB:
				if ((flags & VMFlags.VM_FC.getFlag()) != 0) {
					setIP(getValue(false, mem, op1));
					continue;
				}
				break;
			case VM_JBE:
				if ((flags & (VMFlags.VM_FC.getFlag() | VMFlags.VM_FZ.getFlag())) != 0) {
					setIP(getValue(false, mem, op1));
					continue;
				}
				break;
			case VM_JA:
				if ((flags & (VMFlags.VM_FC.getFlag() | VMFlags.VM_FZ.getFlag())) == 0) {
					setIP(getValue(false, mem, op1));
					continue;
				}
				break;
			case VM_JAE:
				if ((flags & VMFlags.VM_FC.getFlag()) == 0) {
					setIP(getValue(false, mem, op1));
					continue;
				}
				break;
			case VM_PUSH:
				R[7] -= 4;
				setValue(false, mem, R[7] & VM_MEMMASK,
						getValue(false, mem, op1));
				break;
			case VM_POP:
				setValue(false, mem, op1,
						getValue(false, mem, R[7] & VM_MEMMASK));
				R[7] += 4;
				break;
			case VM_CALL:
				R[7] -= 4;
				setValue(false, mem, R[7] & VM_MEMMASK, IP + 1);
				setIP(getValue(false, mem, op1));
				continue;
			case VM_NOT:
				setValue(cmd.isByteMode(), mem, op1,
						~getValue(cmd.isByteMode(), mem, op1));
				break;
			case VM_SHL: {
				int value1 = getValue(cmd.isByteMode(), mem, op1);
				int value2 = getValue(cmd.isByteMode(), mem, op2);
				int result = value1 << value2;
				flags = (result == 0 ? VMFlags.VM_FZ.getFlag()
						: (result & VMFlags.VM_FS.getFlag()))
						| (((value1 << (value2 - 1)) & 0x80000000) != 0 ? VMFlags.VM_FC
								.getFlag() : 0);
				setValue(cmd.isByteMode(), mem, op1, result);
			}
				break;
			case VM_SHR: {
				int value1 = getValue(cmd.isByteMode(), mem, op1);
				int value2 = getValue(cmd.isByteMode(), mem, op2);
				int result = value1 >>> value2;
				flags = (result == 0 ? VMFlags.VM_FZ.getFlag()
						: (result & VMFlags.VM_FS.getFlag()))
						| ((value1 >>> (value2 - 1)) & VMFlags.VM_FC.getFlag());
				setValue(cmd.isByteMode(), mem, op1, result);
			}
				break;
			case VM_SAR: {
				int value1 = getValue(cmd.isByteMode(), mem, op1);
				int value2 = getValue(cmd.isByteMode(), mem, op2);
				int result = (value1) >> value2;
				flags = (result == 0 ? VMFlags.VM_FZ.getFlag()
						: (result & VMFlags.VM_FS.getFlag()))
						| ((value1 >> (value2 - 1)) & VMFlags.VM_FC.getFlag());
				setValue(cmd.isByteMode(), mem, op1, result);
			}
				break;
			case VM_NEG: {
				int result = -getValue(cmd.isByteMode(), mem, op1);
				flags = result == 0 ? VMFlags.VM_FZ.getFlag() : VMFlags.VM_FC
						.getFlag() | (result & VMFlags.VM_FS.getFlag());
				setValue(cmd.isByteMode(), mem, op1, result);
			}
				break;

			case VM_NEGB:
				setValue(true, mem, op1, -getValue(true, mem, op1));
				break;
			case VM_NEGD:
				setValue(false, mem, op1, -getValue(false, mem, op1));
				break;
			case VM_PUSHA: {
				for (int i = 0, SP = R[7] - 4; i < regCount; i++, SP -= 4) {
					setValue(false, mem, SP & VM_MEMMASK, R[i]);
				}
				R[7] -= regCount * 4;
			}
				break;
			case VM_POPA: {
				for (int i = 0, SP = R[7]; i < regCount; i++, SP += 4)
					R[7 - i] = getValue(false, mem, SP & VM_MEMMASK);
			}
				break;
			case VM_PUSHF:
				R[7] -= 4;
				setValue(false, mem, R[7] & VM_MEMMASK, flags);
				break;
			case VM_POPF:
				flags = getValue(false, mem, R[7] & VM_MEMMASK);
				R[7] += 4;
				break;
			case VM_MOVZX:
				setValue(false, mem, op1, getValue(true, mem, op2));
				break;
			case VM_MOVSX:
				setValue(false, mem, op1, (byte) getValue(true, mem, op2));
				break;
			case VM_XCHG: {
				int value1 = getValue(cmd.isByteMode(), mem, op1);
				setValue(cmd.isByteMode(), mem, op1,
						getValue(cmd.isByteMode(), mem, op2));
				setValue(cmd.isByteMode(), mem, op2, value1);
			}
				break;
			case VM_MUL: {
				int result = (int) ((getValue(cmd.isByteMode(), mem, op1)
						& 0xFFffFFff
						* (long) getValue(cmd.isByteMode(), mem, op2) & 0xFFffFFff) & 0xFFffFFff);
				setValue(cmd.isByteMode(), mem, op1, result);
			}
				break;
			case VM_DIV: {
				int divider = getValue(cmd.isByteMode(), mem, op2);
				if (divider != 0) {
					int result = getValue(cmd.isByteMode(), mem, op1) / divider;
					setValue(cmd.isByteMode(), mem, op1, result);
				}
			}
				break;
			case VM_ADC: {
				int value1 = getValue(cmd.isByteMode(), mem, op1);
				int FC = (flags & VMFlags.VM_FC.getFlag());
				int result = (int) (value1 & 0xFFffFFff
						+ (long) getValue(cmd.isByteMode(), mem, op2)
						& 0xFFffFFff + (long) FC & 0xFFffFFff);
				if (cmd.isByteMode()) {
					result &= 0xff;
				}

				flags = (result < value1 || result == value1 && FC != 0) ? 1
						: 0 | (result == 0 ? VMFlags.VM_FZ.getFlag()
								: (result & VMFlags.VM_FS.getFlag()));
				setValue(cmd.isByteMode(), mem, op1, result);
			}
				break;
			case VM_SBB: {
				int value1 = getValue(cmd.isByteMode(), mem, op1);
				int FC = (flags & VMFlags.VM_FC.getFlag());
				int result = (int) (value1 & 0xFFffFFff
						- (long) getValue(cmd.isByteMode(), mem, op2)
						& 0xFFffFFff - (long) FC & 0xFFffFFff);
				if (cmd.isByteMode()) {
					result &= 0xff;
				}
				flags = (result > value1 || result == value1 && FC != 0) ? 1
						: 0 | (result == 0 ? VMFlags.VM_FZ.getFlag()
								: (result & VMFlags.VM_FS.getFlag()));
				setValue(cmd.isByteMode(), mem, op1, result);
			}
				break;

			case VM_RET:
				if (R[7] >= VM_MEMSIZE) {
					return (true);
				}
				setIP(getValue(false, mem, R[7] & VM_MEMMASK));
				R[7] += 4;
				continue;

			case VM_STANDARD:
				ExecuteStandardFilter(VMStandardFilters.findFilter(cmd.getOp1()
						.getData()));
				break;
			case VM_PRINT:
				break;
			}
			IP++;
			--maxOpCount;
		}
	}

	public void prepare(byte[] code, int codeSize, VMPreparedProgram prg) {
		InitBitInput();
		int cpLength = Math.min(MAX_SIZE, codeSize);
		for (int i = 0; i < cpLength; i++) // memcpy(inBuf,Code,Min(CodeSize,BitInput::MAX_SIZE));
		{
			inBuf[i] |= code[i];
		}

		byte xorSum = 0;
		for (int i = 1; i < codeSize; i++) {
			xorSum ^= code[i];
		}

		faddbits(8);

		prg.setCmdCount(0);
		if (xorSum == code[0]) {
			VMStandardFilters filterType = IsStandardFilter(code, codeSize);
			if (filterType != VMStandardFilters.VMSF_NONE) {

				VMPreparedCommand curCmd = new VMPreparedCommand();
				curCmd.setOpCode(VMCommands.VM_STANDARD);
				curCmd.getOp1().setData(filterType.getFilter());
				curCmd.getOp1().setType(VMOpType.VM_OPNONE);
				curCmd.getOp2().setType(VMOpType.VM_OPNONE);
				codeSize = 0;
				prg.getCmd().add(curCmd);
				prg.setCmdCount(prg.getCmdCount() + 1);
				// TODO
				// curCmd->Op1.Data=FilterType;
				// >>>>>> CurCmd->Op1.Addr=&CurCmd->Op1.Data; <<<<<<<<<< not set
				// do i need to ?
				// >>>>>> CurCmd->Op2.Addr=&CurCmd->Op2.Data; <<<<<<<<<< "
				// CurCmd->Op1.Type=CurCmd->Op2.Type=VM_OPNONE;
				// CodeSize=0;
			}
			int dataFlag = fgetbits();
			faddbits(1);

			// Read static data contained in DB operators. This data cannot be
			// changed,
			// it is a part of VM code, not a filter parameter.

			if ((dataFlag & 0x8000) != 0) {
				long dataSize = (long) ReadData(this) & 0xffFFffFF + 1;
				for (int i = 0; inAddr < codeSize && i < dataSize; i++) {
					prg.getStaticData().add(
							Byte.valueOf((byte) (fgetbits() >> 8)));
					faddbits(8);
				}
			}

			while (inAddr < codeSize) {
				VMPreparedCommand curCmd = new VMPreparedCommand();
				int data = fgetbits();
				if ((data & 0x8000) == 0) {
					curCmd.setOpCode(VMCommands.findVMCommand((data >> 12)));
					faddbits(4);
				} else {
					curCmd.setOpCode(VMCommands
							.findVMCommand((data >> 10) - 24));
					faddbits(6);
				}
				if ((VMCmdFlags.VM_CmdFlags[curCmd.getOpCode().getVMCommand()] & VMCmdFlags.VMCF_BYTEMODE) != 0) {
					curCmd.setByteMode((fgetbits() >> 15) == 1 ? true : false);
					faddbits(1);
				} else {
					curCmd.setByteMode(false);
				}
				curCmd.getOp1().setType(VMOpType.VM_OPNONE);
				curCmd.getOp2().setType(VMOpType.VM_OPNONE);

				int opNum = (VMCmdFlags.VM_CmdFlags[curCmd.getOpCode()
						.getVMCommand()] & VMCmdFlags.VMCF_OPMASK);
				// TODO >>> CurCmd->Op1.Addr=CurCmd->Op2.Addr=NULL; <<<???
				if (opNum > 0) {
					decodeArg(curCmd.getOp1(), curCmd.isByteMode());
					if (opNum == 2)
						decodeArg(curCmd.getOp2(), curCmd.isByteMode());
					else {
						if (curCmd.getOp1().getType() == VMOpType.VM_OPINT
								&& (VMCmdFlags.VM_CmdFlags[curCmd.getOpCode()
										.getVMCommand()] & (VMCmdFlags.VMCF_JUMP | VMCmdFlags.VMCF_PROC)) != 0) {
							int distance = curCmd.getOp1().getData();
							if (distance >= 256)
								distance -= 256;
							else {
								if (distance >= 136) {
									distance -= 264;
								} else {
									if (distance >= 16) {
										distance -= 8;
									} else {
										if (distance >= 8) {
											distance -= 16;
										}
									}
								}
								distance += prg.getCmdCount();
							}
							curCmd.getOp1().setData(distance);
						}
					}
				}
				prg.setCmdCount(prg.getCmdCount() + 1);
				prg.getCmd().add(curCmd);
			}
		}
		VMPreparedCommand curCmd = new VMPreparedCommand();
		curCmd.setOpCode(VMCommands.VM_RET);
		// TODO CurCmd->Op1.Addr=&CurCmd->Op1.Data;
		// CurCmd->Op2.Addr=&CurCmd->Op2.Data;
		curCmd.getOp1().setType(VMOpType.VM_OPNONE);
		curCmd.getOp2().setType(VMOpType.VM_OPNONE);

		// for (int i=0;i<prg.getCmdCount();i++)
		// {
		// VM_PreparedCommand *Cmd=&Prg->Cmd[I];
		// if (Cmd->Op1.Addr==NULL)
		// Cmd->Op1.Addr=&Cmd->Op1.Data;
		// if (Cmd->Op2.Addr==NULL)
		// Cmd->Op2.Addr=&Cmd->Op2.Data;
		// }

		prg.getCmd().add(curCmd);
		prg.setCmdCount(prg.getCmdCount() + 1);
		// #ifdef VM_OPTIMIZE
		if (codeSize != 0) {
			optimize(prg);
		}
	}

	private void decodeArg(VMPreparedOperand op, boolean byteMode) {
		int data = fgetbits();
		if ((data & 0x8000) != 0) {
			op.setType(VMOpType.VM_OPREG);
			op.setData((data >> 12) & 7);
			op.setOffset(op.getData());
			faddbits(4);
		} else {
			if ((data & 0xc000) == 0) {
				op.setType(VMOpType.VM_OPINT);
				if (byteMode) {
					op.setData((data >> 6) & 0xff);
					faddbits(10);
				} else {
					faddbits(2);
					op.setData(ReadData(this));
				}
			} else {
				op.setType(VMOpType.VM_OPREGMEM);
				if ((data & 0x2000) == 0) {
					op.setData((data >> 10) & 7);
					op.setOffset(op.getData());
					op.setBase(0);
					faddbits(6);
				} else {
					if ((data & 0x1000) == 0) {
						op.setData((data >> 9) & 7);
						op.setOffset(op.getData());
						faddbits(7);
					} else {
						op.setData(0);
						faddbits(4);
					}
					op.setBase(ReadData(this));
				}
			}
		}

	}

	private void optimize(VMPreparedProgram prg) {
		List<VMPreparedCommand> commands = prg.getCmd();

		for (VMPreparedCommand cmd : commands) {
			switch (cmd.getOpCode()) {
			case VM_MOV:
				cmd.setOpCode(cmd.isByteMode() ? VMCommands.VM_MOVB
						: VMCommands.VM_MOVD);
				continue;
			case VM_CMP:
				cmd.setOpCode(cmd.isByteMode() ? VMCommands.VM_CMPB
						: VMCommands.VM_CMPD);
				continue;
			}
			if ((VMCmdFlags.VM_CmdFlags[cmd.getOpCode().getVMCommand()] & VMCmdFlags.VMCF_CHFLAGS) == 0) {
				continue;
			}
			boolean flagsRequired = false;

			for (int i = commands.indexOf(cmd) + 1; i < commands.size(); i++) {
				int flags = VMCmdFlags.VM_CmdFlags[commands.get(i).getOpCode()
						.getVMCommand()];
				if ((flags & (VMCmdFlags.VMCF_JUMP | VMCmdFlags.VMCF_PROC | VMCmdFlags.VMCF_USEFLAGS)) != 0) {
					flagsRequired = true;
					break;
				}
				if ((flags & VMCmdFlags.VMCF_CHFLAGS) != 0) {
					break;
				}
			}
			if (flagsRequired) {
				continue;
			}
			switch (cmd.getOpCode()) {
			case VM_ADD:
				cmd.setOpCode(cmd.isByteMode() ? VMCommands.VM_ADDB
						: VMCommands.VM_ADDD);
				continue;
			case VM_SUB:
				cmd.setOpCode(cmd.isByteMode() ? VMCommands.VM_SUBB
						: VMCommands.VM_SUBD);
				continue;
			case VM_INC:
				cmd.setOpCode(cmd.isByteMode() ? VMCommands.VM_INCB
						: VMCommands.VM_INCD);
				continue;
			case VM_DEC:
				cmd.setOpCode(cmd.isByteMode() ? VMCommands.VM_DECB
						: VMCommands.VM_DECD);
				continue;
			case VM_NEG:
				cmd.setOpCode(cmd.isByteMode() ? VMCommands.VM_NEGB
						: VMCommands.VM_NEGD);
				continue;
			}
		}

	}

	public static int ReadData(BitInput rarVM) {
		int data = rarVM.fgetbits();
		switch (data & 0xc000) {
		case 0:
			rarVM.faddbits(6);
			return ((data >> 10) & 0xf);
		case 0x4000:
			if ((data & 0x3c00) == 0) {
				data = 0xffffff00 | ((data >> 2) & 0xff);
				rarVM.faddbits(14);
			} else {
				data = (data >> 6) & 0xff;
				rarVM.faddbits(10);
			}
			return (data);
		case 0x8000:
			rarVM.faddbits(2);
			data = rarVM.fgetbits();
			rarVM.faddbits(16);
			return (data);
		default:
			rarVM.faddbits(2);
			data = (rarVM.fgetbits() << 16);
			rarVM.faddbits(16);
			data |= rarVM.fgetbits();
			rarVM.faddbits(16);
			return (data);
		}
	}

	private VMStandardFilters IsStandardFilter(byte[] code, int codeSize) {
		VMStandardFilterSignature stdList[] = {
				new VMStandardFilterSignature(53, 0xad576887,
						VMStandardFilters.VMSF_E8),
				new VMStandardFilterSignature(57, 0x3cd7e57e,
						VMStandardFilters.VMSF_E8E9),
				new VMStandardFilterSignature(120, 0x3769893f,
						VMStandardFilters.VMSF_ITANIUM),
				new VMStandardFilterSignature(29, 0x0e06077d,
						VMStandardFilters.VMSF_DELTA),
				new VMStandardFilterSignature(149, 0x1c2c5dc8,
						VMStandardFilters.VMSF_RGB),
				new VMStandardFilterSignature(216, 0xbc85e701,
						VMStandardFilters.VMSF_AUDIO),
				new VMStandardFilterSignature(40, 0x46b9c560,
						VMStandardFilters.VMSF_UPCASE) };
		int CodeCRC = RarCRC.checkCrc(0xffffffff, code, 0, code.length) ^ 0xffffffff;
		for (int i = 0; i < stdList.length; i++) {
			if (stdList[i].getCRC() == CodeCRC
					&& stdList[i].getLength() == code.length) {
				return (stdList[i].getType());
			}

		}
		return (VMStandardFilters.VMSF_NONE);
	}

	private void ExecuteStandardFilter(VMStandardFilters filterType) {
		switch (filterType) {
		case VMSF_E8:
		case VMSF_E8E9: {
			int dataSize = R[4];
			long fileOffset = R[6] & 0xFFffFFff;

			if (dataSize >= VM_GLOBALMEMADDR) {
				break;
			}
			int fileSize = 0x1000000;
			byte cmpByte2 = (byte) ((filterType == VMStandardFilters.VMSF_E8E9) ? 0xe9
					: 0xe8);
			for (int curPos = 0; curPos < dataSize - 4;) {
				byte curByte = mem[curPos++];
				if (curByte == 0xe8 || curByte == cmpByte2) {
					// #ifdef PRESENT_INT32
					// sint32 Offset=CurPos+FileOffset;
					// sint32 Addr=GET_VALUE(false,Data);
					// if (Addr<0)
					// {
					// if (Addr+Offset>=0)
					// SET_VALUE(false,Data,Addr+FileSize);
					// }
					// else
					// if (Addr<FileSize)
					// SET_VALUE(false,Data,Addr-Offset);
					// #else
					long offset = curPos + fileOffset;
					long Addr = getValue(false, mem, curPos);
					if ((Addr & 0x80000000) != 0) {
						if (((Addr + offset) & 0x80000000) == 0)
							setValue(false, mem, curPos, (int) Addr + fileSize);
					} else {
						if (((Addr - fileSize) & 0x80000000) != 0) {
							setValue(false, mem, curPos, (int) (Addr - offset));
						}
					}
					// #endif
					curPos += 4;
				}
			}
		}
			break;
		case VMSF_ITANIUM: {

			int dataSize = R[4];
			long fileOffset = R[6] & 0xFFffFFff;

			if (dataSize >= VM_GLOBALMEMADDR) {
				break;
			}
			int curPos = 0;
			final byte Masks[] = { 4, 4, 6, 6, 0, 0, 7, 7, 4, 4, 0, 0, 4, 4, 0,
					0 };
			fileOffset >>>= 4;

			while (curPos < dataSize - 21) {
				int Byte = (mem[curPos] & 0x1f) - 0x10;
				if (Byte >= 0) {

					byte cmdMask = Masks[Byte];
					if (cmdMask != 0)
						for (int i = 0; i <= 2; i++)
							if ((cmdMask & (1 << i)) != 0) {
								int startPos = i * 41 + 5;
								int opType = filterItanium_GetBits(curPos,
										startPos + 37, 4);
								if (opType == 5) {
									int offset = filterItanium_GetBits(curPos,
											startPos + 13, 20);
									filterItanium_SetBits(
											curPos,
											(int) (offset - fileOffset) & 0xfffff,
											startPos + 13, 20);
								}
							}
				}
				curPos += 16;
				fileOffset++;
			}
		}
			break;
		case VMSF_DELTA: {
			int dataSize = R[4] & 0xFFffFFff;
			int channels = R[0] & 0xFFffFFff;
			int srcPos = 0;
			int border = (dataSize * 2) & 0xFFffFFff;
			setValue(false, mem, VM_GLOBALMEMADDR + 0x20, dataSize);
			if (dataSize >= VM_GLOBALMEMADDR / 2) {
				break;
			}
			// bytes from same channels are grouped to continual data blocks,
			// so we need to place them back to their interleaving positions

			for (int curChannel = 0; curChannel < channels; curChannel++) {
				byte PrevByte = 0;
				for (int destPos = dataSize + curChannel; destPos < border; destPos += channels) {
					mem[destPos] = (PrevByte -= mem[srcPos++]);
				}

			}
		}
			break;
		case VMSF_RGB: {
			// byte *SrcData=Mem,*DestData=SrcData+DataSize;
			int dataSize = R[4], width = R[0] - 3, posR = R[1];
			int channels = 3;
			int srcPos = 0;
			int destDataPos = dataSize;
			setValue(false, mem, VM_GLOBALMEMADDR + 0x20, dataSize);
			if (dataSize >= VM_GLOBALMEMADDR / 2 || posR < 0) {
				break;
			}
			for (int curChannel = 0; curChannel < channels; curChannel++) {
				long prevByte = 0;

				for (int i = curChannel; i < dataSize; i += channels) {
					long predicted;
					int upperPos = i - width;
					if (upperPos >= 3) {
						int upperDataPos = destDataPos + upperPos;
						int upperByte = mem[upperDataPos] & 0xff;
						int upperLeftByte = mem[upperDataPos - 3] & 0xff;
						predicted = prevByte + upperByte - upperLeftByte;
						int pa = Math.abs((int) (predicted - prevByte));
						int pb = Math.abs((int) (predicted - upperByte));
						int pc = Math.abs((int) (predicted - upperLeftByte));
						if (pa <= pb && pa <= pc) {
							predicted = prevByte;
						} else {
							if (pb <= pc) {
								predicted = upperByte;
							} else {
								predicted = upperLeftByte;
							}
						}
					} else {
						predicted = prevByte;
					}

					prevByte = (predicted - mem[srcPos++] & 0xff) & 0xff;
					mem[destDataPos + i] = (byte) (prevByte & 0xff);

				}
			}
			for (int i = posR, border = dataSize - 2; i < border; i += 3) {
				byte G = mem[destDataPos + i + 1];
				mem[destDataPos + i] += G;
				mem[destDataPos + i + 2] += G;
			}
		}
			break;
		case VMSF_AUDIO: {
			int dataSize = R[4], channels = R[0];
			int srcPos = 0;
			int destDataPos = dataSize;
			// byte *SrcData=Mem,*DestData=SrcData+DataSize;
			setValue(false, mem, VM_GLOBALMEMADDR + 0x20, dataSize);
			if (dataSize >= VM_GLOBALMEMADDR / 2) {
				break;
			}
			for (int curChannel = 0; curChannel < channels; curChannel++) {
				long prevByte = 0;
				long prevDelta = 0;
				long Dif[] = new long[7];
				int D1 = 0, D2 = 0, D3;
				int K1 = 0, K2 = 0, K3 = 0;

				for (int i = curChannel, byteCount = 0; i < dataSize; i += channels, byteCount++) {
					D3 = D2;
					D2 = (int) prevDelta - D1;
					D1 = (int) prevDelta;

					long predicted = 8 * prevByte + K1 * D1 + K2 * D2 + K3 * D3;
					predicted = (predicted >>> 3) & 0xff;

					long curByte = mem[srcPos++] & 0xff;

					predicted = (predicted - curByte) & UINT_MASK;
					mem[destDataPos + i] = (byte) predicted;
					prevDelta = (byte) (predicted - prevByte);
					prevByte = predicted;

					int D = ((byte) curByte) << 3;

					Dif[0] += Math.abs(D);
					Dif[1] += Math.abs(D - D1);
					Dif[2] += Math.abs(D + D1);
					Dif[3] += Math.abs(D - D2);
					Dif[4] += Math.abs(D + D2);
					Dif[5] += Math.abs(D - D3);
					Dif[6] += Math.abs(D + D3);

					if ((byteCount & 0x1f) == 0) {
						long minDif = Dif[0], numMinDif = 0;
						Dif[0] = 0;
						for (int j = 1; j < Dif.length; j++) {
							if (Dif[j] < minDif) {
								minDif = Dif[j];
								numMinDif = j;
							}
							Dif[j] = 0;
						}
						switch ((int) numMinDif) {
						case 1:
							if (K1 >= -16)
								K1--;
							break;
						case 2:
							if (K1 < 16)
								K1++;
							break;
						case 3:
							if (K2 >= -16)
								K2--;
							break;
						case 4:
							if (K2 < 16)
								K2++;
							break;
						case 5:
							if (K3 >= -16)
								K3--;
							break;
						case 6:
							if (K3 < 16)
								K3++;
							break;
						}
					}
				}
			}
		}
			break;
		case VMSF_UPCASE: {
			int dataSize = R[4], srcPos = 0, destPos = dataSize;
			if (dataSize >= VM_GLOBALMEMADDR / 2) {
				break;
			}
			while (srcPos < dataSize) {
				byte curByte = mem[srcPos++];
				if (curByte == 2 && (curByte = mem[srcPos++]) != 2) {
					curByte -= 32;
				}
				mem[destPos++] = curByte;
			}
			setValue(false, mem, VM_GLOBALMEMADDR + 0x1c, destPos - dataSize);
			setValue(false, mem, VM_GLOBALMEMADDR + 0x20, dataSize);
		}
			break;
		}

	}

	private void filterItanium_SetBits(int curPos, int bitField, int bitPos,
			int bitCount) {
		int inAddr = bitPos / 8;
		int inBit = bitPos & 7;
		int andMask = 0xffffffff >>> (32 - bitCount);
		andMask = ~(andMask << inBit);

		bitField <<= inBit;

		for (int i = 0; i < 4; i++) {
			mem[curPos + inAddr + i] &= andMask;
			mem[curPos + inAddr + i] |= bitField;
			andMask = (andMask >>> 8) | 0xff000000;
			bitField >>>= 8;
		}

	}

	private int filterItanium_GetBits(int curPos, int bitPos, int bitCount) {
		int inAddr = bitPos / 8;
		int inBit = bitPos & 7;
		int bitField = mem[curPos + inAddr++] & 0xff;
		bitField |= (mem[curPos + inAddr++] & 0xff) << 8;
		bitField |= (mem[curPos + inAddr++] & 0xff) << 16;
		bitField |= (mem[curPos + inAddr] & 0xff) << 24;
		bitField >>>= inBit;
		return (bitField & (0xffffffff >>> (32 - bitCount)));
	}

	public void setMemory(int pos, byte[] data, int offset, int dataSize) {
		if (pos < VM_MEMSIZE) { // && data!=Mem+Pos)
			// memmove(Mem+Pos,Data,Min(DataSize,VM_MEMSIZE-Pos));
			for (int i = 0; i < Math.min(data.length - offset, dataSize); i++) {
				if ((VM_MEMSIZE - pos) < i) {
					break;
				}
				mem[pos + i] = data[offset + i];
			}
		}
	}

}

//